If you have 80 points for the Subclass 189 visa in construction, your invitation could come anytime depending on the demand for your occupation and the current competition. Generally, invitations for 189 start going out from around 75+ points, and 80 points is quite competitive. Invitations are issued monthly, so with 80 points, you can expect an invitation within a few months, but it varies by occupation and timing in the invitation round